Structural framework of sheds, bridges, and the like



Sqn. 15, 192s.l

H.l N. WYLIE STRUCTURAL V.FRAMEWORK SEEDS', BRIDGES, AND THE LIKE Filed Oct. 31, .1924 2v Sheets-Sheet 1 Il lll l lll sept 15, 1925 v H. N. wYuE STRUCTUAL- FRAIB'ORK OP SHBDS, BRINIS, All# u" rma ouv.. s1. 1m siem-sheet a,

position prior to extension.

Patented Sept. 15, 1925.

UNITED STATES HAMILTON NE1L wYLIE, or LONDON, ENGLAND.

' STRUCTURAL FRAMEWORK or sirens, BRIDGES, AND THE: LIKE.

Application led October 31, 1924. Serial No. 747,017.

To all 'whom t may concern.

Be itknown that HAMILTON NEIL WYLm, a British subject, .residing at Central House, Kingsway, London, W. C. 2, England, has invented certain new and useful Improvements in Structural Framework of Sheds, Bridges, and the like, of which the ollow ing is a speciiication.

This invention relates to structural frameworks, often referred to as bents, in which a horizontally disposed structure such as a roof truss, platform bridge or thel like is supported upon upright-s orstanchions.

The object of the invention is to provide an improved means for erecting and taking down such structures particularly when of a temporary or portable nature.

' In erecting the bent in accordance with the invention the. girder is connected to the 'ends of the stanchions, which will ulti-l mately be in the upper position and which will be referred to as the upper ends, the lower ends being pivoted to fixed bases, and one of the stanchions is then extended. The upper end is then constrained to move in a circular arc the centre of which is the other end of the girder and when raised to its fullest extent is guyed whereupon the other stanchion is extended andthe girder rises withk it.

The invention is particularly applicable to metal framework for portable aircraft sheds which must be light and composed of short members for transport and must be capable of being easily erected,`preferably with the canvas or other covering for thev` root in position.

In accordance with this `invention the stanchions comprise two levers the fulcrum of each of which is pivoted to a rigid link one arm of each lever being connected by a member of variable length, the arrangement being such that by shortening this member of variable length the ends of the other arms may be moved from a position in which they are relatively near to an extended` position in which these latter arms make with the rigid member an anglev approaching 180 degrees.

In the accompanying drawings which illustrate a preferred embodiment of the invention, Y

Fig. 1 represents a view of the bent in the process of erection.

Fig. 2 represents a stanchion l 'its bent Fig. 3 represents a stanchion partly eX- tended.

Fig. t represents in detail the lower portion of a stanchion in fully extendedposition.

Referring iirst to Figs. 2 and 3, each stanchion comprises two levers B, C pivoted at points a, to a rigid link A; extensions B:l C1 of these levers are connected by a cable F which passes over pulleys 7"'1, 2 and canrbe varied in lengthy by means of a drum G operated by a handle g. Bracing members B2, B3, B4, B5, B6, andCz, C3, C* are provided to give increased strength to the levers.

The end of t-he lever B is pivotedgtoa `foundation base E and in the position shown in Fig. :2 the end c of the lever C is close to the base E; this end 'c is hinged to one end of the girder I-I, which in thek form shown is a root truss and is shown in Fig. 1 in full lines with one end raised. If now the cable F be shortened, the levers will turn about thepivots a, and as the .end o is constrained to move in a circular arc of radius equal to the span ofthe girder H, the latter being initially on the ground, both levers will rise, as shown in Fig. 3 and will ultimately come to the position shown in Fig. 1 where the endsm z/ of the levers come together. i

These ends are then-secured in position by a locking member J, Fig. fl. VIt will be noted in Fig. 1 that when' the stanchion is in its fully extended position the members B, A and C are not collinear; this ensures that the'locking member will always be in tension and thus make it possible to `detail this member as a flexible one.` With the arrangement of levers shown in Figs. 2 and 3 the tension in the member F and therefore the force which has to be applied to the drum in winding will remain nearly constant as the stanchion moves from oneextreme position to another. `Thatis to say, the arm B causes the perpendicular distance between the cable F and member A to `vary in approximately the same degree as the perpendicular distance between the member A and the weighted end c varies as extension takes place." VThus it may be said that the maximum tension is very little in excess of the average tension throughout the operation.

In erecting the bent in accordance with this invention the stanchon at each. end is brought tothe position shoivn in Figa/.2 and the girder or roof truss H is then pivoted at each end to the ends C. One stanchion is then extended and the girder at vthis end then moves ina circularl arc about the other end as centre ;Y When this stanchion is fully extended the parts assiune the position shown in full lines in Fig. l. A guy rope K is then gput in .posi-tion at vthe end C and the other stanchion is then extended thus bringing thefp'artssto' theV position shown indotted lines 1in Fig.- .1.- The ,position of y the parts 1 in the extreme position are shown in Fig.` 4. iWhen this position isreached, .the locking member y' is securedfto.bothlparts, the auxili-aryrig arm ('B) can then be-reinoved; in practiceit isremoved When'one side of the structure'hasbeen erected and-is movedover `onta-the other side andthen remains there A:toruse in dismantling the-second side iirst. vThe guys' are then adjusted to bring .the -ereeted structure 1 to Iiinal `vor symmetrical positio-n. p

The .invention is applicable to cases in .which-,one .ofthe uprights or stanchions of .the bent-is -an existing structurefto `the top ...-otwhfich-accesslcan be' obtained.` 4For examp-le .the structure may bekerected upon one existing Wall .first ilitedjto the top ofthe ivalland the .fother end is raised by the aid o-astancliion ;A one end. of thezgirder is then operati-ng .the .manner previously described. v

`" .ainiodiication the .eri-gid link A may comprise. a triangulated 4or otherwisev formed. ,'framestrueturm and in all forms the shortf -sening .member .F .-mayebe formed in tivo sepa- :unes-ted to one arm of eacliyot .said Sievers,

p .rate .elements each separately connecting one of the levers tothe rigid link and 'capable of .separate adjustment. f

' -.claimrn y Y l. 1A :stanehionfadapted to be used in a v.frair-ied structure comprising a frigidlink,-

two levers pivoted to said .link at L'points 1in- ;termediate their ends-andra.member consaid member .beirrgrofadjustable length-so :that on being shortenedthe-.free arms of said levers move'. apart. andzincrease lthe effective .length-i oithe` stanchion, and vthe irstfnained :arms comeiinto-contact With one anothe-rto -ferm,.a.triaiigle with `the linkes its base.

,52A "stanchion adapted to be used in a v 4#iianeedstructureeoinprising.a rigid link, a

Cil

fleverlpi-vote'd atene end ofsaid link, a lever 'piveted at4 theiothcr rend off saidlink, a member of variable lengthY connecting an arm of 'one of saidlleverslito an arm=of the other'of f :said-levers,- the freeendsof saidr levers mov- Iing Y-fromf proximity .to one another (when -saidfmemberislengthenecD 'a distance apart approximately representing ythe f sum of jthe :lengthsef .said iiree arms and said link whenSadmemberisshortened i 3.. A stanchion adapted to be used in a tically 'collinear -with .the rigid link and tof any :intermediate position .at will.

v A. stanchi-'on Vadapted to ibe used ina framed structure comprising' a Vrigid link, tivo leverspivoted to saidlink at points intermediate .their ends, and a member con-` ncctedto onevarm of each of said levers, said member being of adjustableflength so` that onfbeing shortened, the free arms ofsaid ievers move apartandi'ncrease the effective length of the stanchion, the iirst named arms coming into contact with one another at soinelittle distance from said'link, and lockiing means to retain said contact.

5. Astanchion adapted to be used in a trained structure .comprising a rigidlink, tivo levers pivoted to .said'link -atpoints intermediate .their ends, and va member .connected toy one arm .oifeac'h-'of said levers, said member being, of adjustable length so .that on being: shortened the free arms of'said ,levers move apart land increase the eiective length of the stanchioinftheiiirst-named'arm of one of said levers havingav greater etfeetive length than that of the irs'tnamed arm of the other of said levers orfthe pur- `.poseI of. varying. the inclination oi'saidimemvber to 'saidllink insuch a iv'ayas to main-y tain the tension fin said memberV substantiallyconstant through thegreater portion oct kthe movement of the levers.

lili) G. `stanchifon adapted to "bef used i-n a 4 framed vstructure comprising a base, -a lrigid link, two levers;pivoted respectively at the two endsv'ofsaid link, one arm otone of said -levers beingpivoted to said base and one arm of the other of said levers :beii'ig. adapted to supporta load,and flexible means towdraW towards one another the other arms of said llevers for the purpose :of separating thesaid first-mentioned arms in ,order to raise the-load 7.. Abent comprising a girder, a base un- `der'feachen'd of said girderpa fpair of exitens'ible stanchicns onepivoted ateach yend of saidgirder Vand to .the corresponding base, means vto, extendone y'stanehion While said girder swings about ythe upper end of the =other inf-.its unextended position, and -ineans to( extend the second Vstanchion While said girder swings about the upper endv of said iirst-name'd stanchion.

8. A bent comprising a girder pivotedat eacu end to one of a pair of istanohions, each stanchion comprising tWo arms each pivoted to a rigid connecting link and each having an extension beyond said link, and flexible means connected to said extensions and operable to Vary the relative positions of said arms and link from a position in which they form substantially a triangle to a position in Which they form substantially a straight line.

9. A stanohion Comprising a base, an arm adapted to be pivoted to said base, a'link pivoted to said arm7 a second arm pivoted to said link and adapted to carry a load, an extension to each of said arms, ilexible means of Variable length so connected to said parts that when extended sufficiently said arms and said link form substantially a triangle and when shortened sutliciently substantially a straight line, said extensions and said link in the shortened position forming a triangle and means to look the extensions in the last-named position.

10. A bent comprising the parts and arrangement set out in claim 7 together with guys attached adjacent the upper ends of said stanchions.

In testimony whereof I aliix my signature.

HAMILTON N. WYLIE. 

